Real-Time Wheel Slip Identification for Vehicle Stability
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Solution Overview
Problem
Vehicle instability occurs due to uneven lateral forces on tires during turns, leading to tire slippage and loss of grip, as one tire can exceed its saturation force while another maintains grip, causing control difficulties.
Innovation Solution
A system and method that determine lateral forces on tires, adjust torques to achieve maximal grip by transferring forces between tires, using a processor to calculate ideal slip ratios and adjust torques based on saturation levels and real-time road conditions, and transfer torque between axles to balance forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If lateral force on one tire exceeds saturation force during a turn, then vehicle turning capability is maintained, but tire grip is lost and vehicle instability occurs
Solution Approach 1:
The system applies different torque adjustments to different tires based on their individual saturation levels. The processor monitors lateral forces on each tire separately and adjusts torque locally on saturated tires while maintaining or increasing torque on unsaturated tires, optimizing grip distribution across the tire set
Solution Approach 2:
The system dynamically changes torque parameters applied to individual tires based on real-time saturation detection. When a tire approaches saturation, the processor reduces torque on that specific tire to prevent slip, while redistributing torque to unsaturated tires to maintain overall vehicle performance
2Reliability
If torque is reduced on a saturated tire to prevent slippage, then tire grip is maintained, but longitudinal force and propulsion capability are reduced
Solution Approach 1:
The system merges the propulsion demand from saturated tires with unsaturated tires by redistributing torque. The processor calculates the remaining grip capacity of unsaturated tires and transfers torque to them, combining their grip resources to meet the vehicle's longitudinal force requirements while preventing slippage on saturated tires
3Reliability
If torque distribution is adjusted in real-time based on tire saturation, then maximal grip is achieved, but system complexity increases
Solution Approach 1:
The system implements a feedback loop where the processor continuously monitors lateral forces on each tire, detects saturation conditions, and automatically adjusts torque distribution in response. This closed-loop control achieves maximal grip by adapting torque allocation to real-time tire conditions without requiring complex manual intervention
Data Source
AI summary
A vehicle, system and method of operating the vehicle. A sensor measures a dynamic parameter of the vehicle. A processor determines a lateral force on a first tire based on the dynamic parameter of the vehicle, determines a longitudinal force on the first tire that achieves a maximal grip of the first tire for the lateral force, and adjusts a first torque on the first tire in order to achieve the determined longitudinal force at the first tire.